Prethodno priopćenje

Thermodynamic stability of austenitic Ni-Mn-Cu cast iron

A. Janus ; Wroclaw University of Technology, Department of Foundry Engi-neering and Automation, Wrocław, Poland
M. Stachowicz ; Wroclaw University of Technology, Department of Foundry Engi-neering and Automation, Wrocław, Poland

Sažetak

The performed research was aimed at determining thermodynamic stability of structures of Ni-Mn-Cu cast iron castings. Examined were 35 alloys. The castings were tempered at 900 °C for 2 hours. Two cooling speeds were used: furnace-cooling and water-cooling. In the alloys with the nickel equivalent value less than 20,0 %, partial transition of austenite to martensite took place. The austenite decomposition ratio and the related growth of hardness was higher for smaller nickel equivalent value and was clearly larger in annealed castings than in hardened ones. Obtaining thermodynamically stable structure of castings requires larger than 20,0 % value of the nickel equivalent.

Ključne riječi

austenitic cast iron; heat treatment; structure martensitic transition; cooling, nickel equivalent

Hrčak ID:

119550

URI

https://hrcak.srce.hr/119550

Datum izdavanja:

1.7.2014.

Posjeta: 1.183 *